1、 Person、Student类定义在JavaOop类里面，属于内部类， private String school是private 级别，Student类的s实例可以直接引用 School属性 2、将Person、Student类定义在JavaOop类外面，属于外部类，private String school是private 级别，Student类不可以直接引用 School属性，必须s.getSchool()来调用
package IMF;
public class JavaOop {
public static void main(String[] args) { // TODO Auto-generated method stub Student s = new Student(); s.setName("Spark"); s.setAge(6); s.setSchool("Big Data"); System.out.println("Name:"+ s.getName() +" age" + s.getAge()+" school "+ s.getSchool()); s.sayHello(); Cat cat = new Cat(); cat.act(); Dream bigData = new BigData(); bigData.toDo(); }
}
class BigDat
